check items() exists before calling it a mapping

[samuelcolvin]

PyO3/pyo3#2072

previously the

https://github.com/samuelcolvin/pydantic-core/blob/59ed7e071d6bc0b24f88b8e946081178885a1ee7/src/errors/kinds.rs#L64-L65

Error was raised for strings etc., now we correctly use DictType.

This also highlighted problems in how try_instance works which need to be fixed separately, see #109.

[codecov]

Codecov Report

Merging #117 (5da73db) into main (59ed7e0) will decrease coverage by 0.13%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #117      +/-   ##
==========================================
- Coverage   96.80%   96.67%   -0.14%     
==========================================
  Files          41       41              
  Lines        3666     3673       +7     
  Branches       28       28              
==========================================
+ Hits         3549     3551       +2     
- Misses        117      122       +5     

Impacted Files	Coverage Δ
src/input/input_python.rs	93.63% <100.00%> (-2.14%)	⬇️
src/validators/model.rs	98.34% <100.00%> (ø)
src/input/input_json.rs	96.02% <0.00%> (+0.66%)	⬆️

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[samuelcolvin]

This didn't quite work, we had to make more changes in #115.